Ah, the schoolmaster's diagrams never made sense to me, all those arrows and angles. Now I see: light slows in the glass like my chisel in a knot of wood—it must turn to keep its rhythm. The deeper grain pulls the tool, just as the denser medium bends the light.
This truth came to me planing a deodar panel; the blade will follow the run of the grain, not my first intention. It is the same surrender.
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